As of November 10, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Black Hawk Acquisition Corporation. The largest reported stake is Mizuho Financial Group, Inc.'s, at 8.4%. 11 filings are on record since August 7, 2025 (Schedule 13G/A, August 13, 2025).
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Key facts
- · Reporting person: W. R. Berkley Corporation · Sole voting: 0 · Shared voting: 322,086 · Sole dispositive: 0 · Shared dispositive: 322,086 · SCHEDULE 13G/A, 2026-11-09
- · Reporting person: Wolverine Asset Management, LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-11-05
- · Holder: Wolverine Asset Management, LLC · Percent: 5.09% · SCHEDULE 13G/A
- · Reporting person: First Trust Merger Arbitrage Fund · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2025-11-14
- · Reporting person: Kerry Propper · Sole voting: 0 · Shared voting: 240,999 · Sole dispositive: 0 · Shared dispositive: 240,999 · SCHEDULE 13G/A, 2025-11-13
Black Hawk Acquisition Corporation has 11 Schedule 13D or 13G filings on record since 2025-08-07. 3 holders' latest filing reports 5% or more of ordinary shares, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Mizuho Financial Group, Inc. | 8.4% | 750,000 | SCHEDULE 13G/A, 2025-08-13 | 2025-06-30 |
| W. R. Berkley Corporation | 7.8% | 322,086 | SCHEDULE 13G/A, 2026-11-09 | 2026-09-30 |
| 5.8% | 240,999 | SCHEDULE 13G/A, 2025-11-13 | 2025-09-30 | |
| AQR Capital Management, LLC | 3.36% | 139,365 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
| Karpus Management, Inc. | 0% | 0 | SCHEDULE 13G/A, 2025-08-07 | 2025-07-31 |
| Wolverine Asset Management, LLC | 0% | 0 | SCHEDULE 13G/A, 2026-11-05 | 2026-10-13 |
| First Trust Merger Arbitrage Fund | 0% | 0 | SCHEDULE 13G/A, 2025-11-14 | 2025-09-30 |
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More on Black Hawk Acquisition Corporation and the records around it.
Black Hawk Acquisition Corporation elsewhere on the record
Companies that share a holder
- Kerry Propper also filed stake reports on 5 other companies: Cayson Acquisition Corp. (May 2026), Future Vision II Acquisition Corp. (May 2026), Rising Dragon Acquisition Corp. (May 2026)
- First Trust Merger Arbitrage Fund also filed stake reports on 47 other companies: TCW SPECIALTY LENDING LLC (Sep 2026), Blue Foundry Bancorp (Aug 2026), Centurion Acquisition Corp. (Aug 2026)
- Mizuho Financial Group, Inc. also filed stake reports on 74 other companies: Aeon Acquisition I Corp. (Aug 2026), Alpex Acquisition Corp (Aug 2026), Aperture AC (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| W. R. Berkley Corporation | 0 | 322,086 | 0 | 322,086 | SCHEDULE 13G/A, 2026-11-09 |
| Berkley Insurance Company | 0 | 322,086 | 0 | 322,086 | SCHEDULE 13G/A, 2026-11-09 |
| Kerry Propper | 0 | 240,999 | 0 | 240,999 | SCHEDULE 13G/A, 2025-11-13 |
| Antonio Ruiz-Gimenez | 0 | 240,999 | 0 | 240,999 | SCHEDULE 13G/A, 2025-11-13 |
| AQR Capital Management, LLC | 0 | 139,365 | 0 | 139,365 | SCHEDULE 13G/A, 2025-11-12 |
| AQR Capital Management Holdings, LLC | 0 | 139,365 | 0 | 139,365 | SCHEDULE 13G/A, 2025-11-12 |
| AQR Arbitrage, LLC | 0 | 139,365 | 0 | 139,365 | SCHEDULE 13G/A, 2025-11-12 |
| Wolverine Asset Management, LLC | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| Wolverine Holdings, LLC | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| Christopher L. Gust | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| Robert R. Bellick | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| First Trust Merger Arbitrage Fund | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2025-11-14 |
| First Trust Capital Management L.P. | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2025-11-14 |
| First Trust Capital Solutions L.P. | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2025-11-14 |
| FTCS Sub GP LLC | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2025-11-14 |
The latest filing identifies Black Hawk Acquisition Corporation by CUSIP G1148A101 and gives its principal executive office as 4125 Blackhawk Plaza Circle, Suite 166, Danville, CA 94506 (SCHEDULE 13G/A, 2026-11-09).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-07 | Karpus Management, Inc. | 0% | SCHEDULE 13G/A |
| 2025-08-08 | W. R. Berkley Corporation | 5.2% | SCHEDULE 13G |
| 2025-08-13 | Mizuho Financial Group, Inc. | 8.4% | SCHEDULE 13G/A |
| 2025-10-10 | Wolverine Asset Management LLC | 8.64% | SCHEDULE 13G |
| 2025-11-10 | W. R. Berkley Corporation | 7.4% | SCHEDULE 13G/A |
| 2025-11-12 | AQR Capital Management, LLC | 3.36% | SCHEDULE 13G/A |
| 2025-11-13 | Kerry Propper | 5.8% | SCHEDULE 13G/A |
| 2025-11-14 | First Trust Merger Arbitrage Fund | 0% | SCHEDULE 13G/A |
| 2026-10-07 | Wolverine Asset Management, LLC | 5.09% | SCHEDULE 13G/A |
| 2026-11-05 | Wolverine Asset Management, LLC | 0% | SCHEDULE 13G/A |
| 2026-11-09 | W. R. Berkley Corporation | 7.8% | SCHEDULE 13G/A |
Questions about who owns Black Hawk Acquisition Corporation
Who owns Black Hawk Acquisition Corporation?
On this page, 3 holders' latest ownership filings report 5% or more of Black Hawk Acquisition Corporation: Mizuho Financial Group, Inc. (8.4%, Schedule 13G/A, filed 2025-08-13), W. R. Berkley Corporation (7.8%, Schedule 13G/A, filed 2026-11-09) and Kerry Propper (5.8%, Schedule 13G/A, filed 2025-11-13).
Who are the largest shareholders of Black Hawk Acquisition Corporation?
By the share each holder's latest filing reports, the largest holders of Black Hawk Acquisition Corporation on this page are Mizuho Financial Group, Inc. (8.4%), W. R. Berkley Corporation (7.8%) and Kerry Propper (5.8%).
When did Mizuho Financial Group, Inc. buy into Black Hawk Acquisition Corporation?
The filings give report dates, not purchase dates. The earliest filing from Mizuho Financial Group, Inc. on this page is the Schedule 13G/A, filed 2025-08-13, reporting 8.4%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.